.floor-nav {
    position: fixed;
    width: 37px;
    background-color: #ddd;
    left: 50%;
    top: 50%;
    margin-left: -630px;
    // display: none;
}

.floor-nav li {
    text-align: center;
    line-height: 30px;
}

.floor-nav li.active {
    color: red;
}